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21039 (1990 ES4)
Classification: Main-belt Asteroid          SPK-ID: 2021039
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1630340501226119 3.7108e-08  
a 2.427006817096937 1.0564e-08 au
q 2.031322066030434 9.5352e-08 au
i 1.467396969910637 3.329e-06 deg
node 258.0429834763792 0.00015577 deg
peri 345.6245160890895 0.00015659 deg
M 352.4834042205898 1.9844e-05 deg
tp 2459229.335243036215
(2021-Jan-14.83524304)
7.6246e-05 TDB
period 1381.035750448721
3.78
9.0172e-06
2.469e-08
d
yr
n .2606739180235053 1.702e-09 deg/d
Q 2.82269156816344 1.2287e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1233  
   data-arc span      11059 days (30.28 yr)  
   first obs. used      1990-03-02  
   last obs. used      2020-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51166  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:37:00  

Additional Information
 Earth MOID = 1.01679 au 
 Jupiter MOID = 2.19508 au 
 T_jup = 3.491 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.15   n/a E2021B10  
diameter diameter 2.408 km 0.289 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.334   0.086 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21039 (1990 ES4)          Discovered 1990-Mar-02 by Elst, E. W. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1990 ES4 = 1998 MX20 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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